House prices in SW1P (City Of Westminster)

Price per square metre data and charts to help you understand the housing market in SW1P - stats were last calculated on 01 December 2025.

Defining 'SW1P'

This analysis is limited to properties whose postcode starts with "SW1P", this is also called the postcode district. There are no official postcode district names so I've just labelled it SW1P, City Of Westminster. It is shown in red on the map below.

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Price per square metre

Knowing the average house price in SW1P is not much use. However, knowing average price per square metre can be quite useful. Price per sqm allows some comparison between properties of different size. We define price per square metre as the sold price divided by the internal area of a property:

£ per sqm = price ÷ internal area

For example in October 2025, Flat 34 30, Vincent Square, City Of Westminster, SW1P 2NW sold for £550,000. Given the internal area of 52 square metres recorded on the EPC, the price per sqm is £550,000 ÷ 52 sqm = £10,576.

England & Wales have been officially metric since 1965. However house price per square foot is prefered by some estate agents and those of sufficiently advanced age ;-). It is a huge pain to code the automatic conversion for square meters to square feet for all the graphs and charts on SW1P and elsewhere. All the conditionals turn my tidy code for into spaghetti. I will get around to it at some point, but for now you can just divide everything by 10 in your head, move a decimal place and you'll be close enough. If you want to be more precise 1 sqm = 10.76391 sqft.

Distribution of £ per sqm for houses vs flats in SW1P

The chart above is called a histogram, it helps you see the distribution of house price per sqm in SW1P To make this chart we put all the sales data into a series of £ per sqm 'buckets' (e.g. £13,850 to £14,500, £14,500 to £15,150, £15,150 to £15,800 etc...) we then count the number of sales with within in each bucket and plot the results. The histogram is based on 301 sales that took place in SW1P, in the last 24 months.

Generate a custom histogram like the one above but based on your own criteria.

You can see the spread of prices above. This is because although internal area is a key factor in determining valuation, it is not the only factor. Many factors other than size affect desirability; these factors could be condition, aspect, garden size, negotiating power of the vendor etc.

The spread of prices will give you a feel of the typical range to expect in SW1P, City Of Westminster. Notably, only 25% of properties that sold recently were valued at more than £13,110 sqm. For anything to be valued more than this means it has to be more desireable than the clear majority of SW1P homes.

Box plot of £ per sqm for SW1P

Tip: click on the chart to see the values.

The chart above is called a boxplot (or a box-and-whisker plot). Box plots, like histograms, are used to graphically represent the distribution of data, showing the central tendency, spread of the distribution. In the context of £ per square metre property price distributions, box plots represent the variation in property prices within a geographic area e.g. City Of Westminster. The chart above shows a boxplot for 'SW1P' as well as the 'SW' postcode area.

  • Median: The horizontal line inside the box represents the median (£ per square meter). This is the midpoint of the data, meaning 50% of the prices are below this value, and 50% are above. The middle price per square metre in 'SW1P' is £11,370.
  • Interquartile Range (IQR): The box spans from the 25th percentile (Q1) to the 75th percentile (Q3). This is the range where the middle 50% of the data lies, giving a good indication of the typical price spread. Of the 301 transactions in SW1P, City Of Westminster half were sold for between £9,870 and £13,110 per square metre.
  • Whiskers: In our case, the whiskers extend from the 9th percentile (at the lower end) to the 91st percentile (at the upper end), This provides a slightly broader view of the distribution by including the middle 82% of records. The whiskers capture most of the variation but exclude extreme outliers caused by data errors in recording sold house prices or internal area.
  • 'n=' is the number of property transactions the box plot is based on; 301 for SW1P, City Of Westminster.

    • Property price map for City Of Westminster

    Have a look at the interactive price map I created for myself. Use it to explore 'SW1P' house prices all the way down to individual property plots.

    Property price heatmap for City Of Westminster
    House price map for City Of Westminster

    Will SW1P house prices drop in 2025?

    House prices in SW1P fell -3.2% in the last year, -6.8% after inflation. Whether or not this trend will continue depends on many factors, such as wage growth, net migration, interest rates and the level of house building. No one can predict these things with certainty however we can plot the historic trends in house prices in SW1P (City Of Westminster) compared with the wider postcode area 'SW'.You can extrapolate from this based on your own views.

    House price index for SW1P

    Tip: click on the legend items to show/hide different lines

    Download house price index as CSV (premium users only).

    The chart above shows changes in 'SW1P' property prices over the last 20 years. The index is calculated from the average price paid per sqm for property in SW1P and is set to 100 in 2004. The chart compares trends for SW1P, City Of Westminster against those of the broader postcode area 'SW'. What is more interesting is to look at the difference between flats and houses, even those in the same area follow a very different trend, to get a robust enough sample size to see this we need to zoom out and look at house price trends for the entire Westminster local authority.

    The dashed lines show nominal house price changes, the solid lines show the same data adjusted for inflation. Economists call this the 'real' price change. You have to take inflation into account when comparing prices over time. It's calculated using the formula:

    Real Rate of Return = (1 + Nominal Rate) ÷ (1 + Inflation Rate) – 1
    In this formula, the nominal rate is the rate of change before any adjustments, and the inflation rate is taken from the Consumer Price Index. The real rate of return is a more accurate measure of change in value, because £1 today does not have the same buying power as £1 in the past. For example, if a savings account pays an interest rate of 3% per year and the inflation rate is 5% per year, the real rate of return is -2%. This means that the investment's value is shrinking by 2% each year.

    Historic returns for SW1P
    SW area SW1P district
    Nominal Real Nominal Real
    20 yr per annum 4.0% 1.2% 3.8% 1.0%
    20 yr total 120.7% 27.9% 111.6% 22.6%
    10 yr per annum 0.4% -2.7% -1.7% -4.7%
    10 yr total 3.7% -23.9% -15.4% -37.9%
    5 yr per annum 0.2% -4.1% -1.0% -5.3%
    5 yr total 1.0% -19.0% -4.8% -23.7%
    1 yr per annum -3.2% -6.8% -3.2% -6.8%
    1 yr total -3.2% -6.8% -3.2% -6.8%

    This table complements the house price index chart above, presenting the data in a more detailed format. It breaks down the information into 20-year, 10-year, 5-year, and 1-year periods, further categorized by property type. For each period, we display both a per annum rate of change and a total rate of change.

    The total rate of change represents the overall change over the entire period. The formula for total return is:

    Total return = (Index at end of period ÷ Index at start of period) - 1

    The per annum rate of change is the annualized rate of change over the period. This is equivalent to the annual bank savings rate you would need to achieve the same total return over the given period. This annualized return is also known as the Compound Annual Growth Rate (CAGR). The formula for CAGR is:

    CAGR = (1 + Total return) ^ (1 ÷ Number of years) - 1

    Some specific examples:

    • Over the past 20 years, SW1P district have seen a 1.0% annual change when adjusted for inflation. This translates to a total change of 22.6% in real terms.
    • Over the past 5 years, SW area have seen a -4.1% annual change when adjusted for inflation. This translates to a total change of -19.0% in real terms.

    Most recent SW1P sales

    For the most recent sales activity, rather than a summarized average, it is better to see the underlying data. This is shown in the chart below, where blue dots represent individual sales, click on them to see details. If there is an obvious trend you should be able to spot it here amid the noise from outliers.

    Tip: hover over dots to see details

    Street level data

    Street Avg size Avg £sqm Recent sales
    Vincent Square, , SW1P 2N 88 sqm £11,782 31
    Marsham Street, , SW1P 4J 77 sqm £10,927 29
    Marsham Street, , SW1P 3D 75 sqm £11,139 23
    Monck Street, , SW1P 2B 68 sqm £10,967 21
    Regency Street, , SW1P 4A 63 sqm £10,133 19
    John Islip Street, , SW1P 4F 116 sqm £16,361 18
    Thirleby Road, , SW1P 1H 133 sqm £11,562 14
    Page Street, , SW1P 4B 46 sqm £9,202 14

    Search for your street here.

    Nearby geographies

    The table below shows how 'SW1P' compares to the other postcode districts nearby 'SW1P'.

    District Lower quartile Median Upper quartile Sales in last 2yr
    SW9 Clapham £6,530 sqm £7,610 sqm £8,450 sqm 755
    SW8 Kennington £6,940 sqm £8,630 sqm £10,220 sqm 758
    SW7 Knightsbridge £13,120 sqm £16,010 sqm £19,290 sqm 456
    SW6 Fulham £9,150 sqm £10,630 sqm £12,500 sqm 1,878
    SW5 Talbot Road £9,650 sqm £11,810 sqm £14,030 sqm 360
    SW4 Clapham £7,290 sqm £8,660 sqm £10,180 sqm 930
    SW3 Chelsea £13,410 sqm £16,780 sqm £20,370 sqm 641
    SW20 Raynes Park £6,500 sqm £7,540 sqm £8,820 sqm 739
    SW2 Streatham Hill £6,160 sqm £7,130 sqm £8,210 sqm 1,209
    SW1Y London £13,450 sqm £15,370 sqm £17,390 sqm 25

    Raw data

    Our analysis of SW1P is derived from what is essentially a big table of sold prices from Land Registry with added property size information. Below are three rows from this table to give you an idea.

    Address Paid sqm £/sqm
    Flat 34 30, Vincent Square, £550,000
    Oct-2025
    		 52 10,576
    Flat 17 Admiral House, Willow Pl, £592,500
    Oct-2025
    		 83 7,138
    Apartment 306 Romney House, 47, Marsham St, £680,000
    Oct-2025
    		 69 9,855

    See the entire list of all sales in SW1P here.

    About

    I created HouseMetric because I wanted to see this data and analysis myself, I also wanted to teach myself to build a website. Please give me feedback or spread the word about it. I'm constantly tinkering and adding more stuff to it.